Posted by **Erica** on Friday, December 30, 2011 at 10:19am.

From 1990 to 1994, the mail order sales of

health products in the United States can be modeled by

S = 10t 3 + 115t 2 + 25t + 2505

where S is the sales (in millions of dollars) and t is the

number of years since 1990. In what year were about

$3885 million of health products sold? (Hint: First

substitute 3885 for S, then divide both sides by 5.)

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